Passtcert Building Cisco Service Provider Next-Generation Networks 640-875 SPNGN1 dumps book

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Share some CCNA SP 640-875 exam questions and answers below.
What is the default spanning-tree mode of an NNI port on a Cisco ME3400 switch? 
A. multiple spanning tree (mst) 
B. per-vlan rapid spanning tree (rapid-pvst) 
C. per-vlan spanning tree (pvst) 
D. IEEE 802.1D (stp) 
Answer: B

Which three statements about Cisco Discovery Protocol operations on a Cisco ME3400 switch are true? (Choose three.) 
A. Cisco Discovery Protocol is enabled by default on NNI ports. 
B. Cisco Discovery Protocol is enabled by default on all NNI, ENI, and UNI ports. 
C. Cisco Discovery Protocol is disabled by default on ENI ports. 
D. Cisco Discovery Protocol is not supported on NNI or ENI ports. 
E. Cisco Discovery Protocol is not supported on UNI ports. 
Answer: A,C,E

Which two statements about classful or classless routing protocol operations are true? (Choose two.) 
A. Classful routing protocols do not send subnet mask information with their routing updates. 
B. Variable-length subnet masks are supported when using classful routing protocols. 
C. Examples of classless routing protocols include RIPv1, EIGRP, OSPF, and IS-IS. 
D. Classful routing protocols do not support discontiguous subnets. 
Answer: A,D

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